From: "Yan, Zheng" <zyan@redhat.com>
Date: Mon, 28 Aug 2017 15:02:42 +0800
Subject: ceph: fix NULL pointer dereference in ceph_flush_snaps()
Git-commit: c858a0709f991171256db74f4329a1cb8e823764
Patch-mainline: v4.14-rc1
References: FATE#324714
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
fs/ceph/caps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 662ada467c32..5daf86621871 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1469,7 +1469,7 @@ void ceph_flush_snaps(struct ceph_inode_info *ci,
if (psession) {
*psession = session;
- } else {
+ } else if (session) {
mutex_unlock(&session->s_mutex);
ceph_put_mds_session(session);
}